Numerical simulated for tube open-die cold extrusion process using finite element software Deform-3D. Analyzed the influence rule of the surface crack defects on the tube under the processing parameters which is half die angle, friction coefficient in open-die cold extrusion process. The simulation result shows that the closer the central of the tube roughcast the bigger the inner and outer of the maximum speed difference. So it can determine that the surface crack defects are prone at the central of the tube roughcast. It would be bring surface crack defects when the half die angle and the friction coefficient increase. So some necessary measures are taken to effectively avoid the surface crack defects appearance. Advisably decrease the half die angle, ensure favorable superficial treatment and lubrication are the effective measures.
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